massive mimo hybrid beamforming 5g wideband massive mimo hybrid analog-digital pilot contamination channel estimation for massive mimo scheduling beamforming csi estimation v2v v2i v2x faster than nyquist millimeter wave mimo miso coordinated base station rate mse uplink-downlink duality imperfect csi sum rate duality per antenna power constraint spectrum sensing usrp labview transceiver design weighted sum rate optimization sensing throughput tradeoff
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